Richabd vose



R. VUSE.

Car Spring.

Patented Aug.. 27, V1867.

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@the ,Salame amat tu iu tigen trttts that :nu mating gaat http same.

TO ALL WHOM I'l MAY CONCERN:

Be it known that I, RICVHARnVOsE, of the city, county, and State of New York, have invented a new and useful improvement in Volute Springs; and I do yhereby declare the following to be a. full, clear, and exact description thereof, reference being hadto the accompanying drawings, forming a part of this specification, in A Which-- Figurel is an elevation.

Figure 2, a transverse section in the line :v of fig. 1. i

Figure 3, a plan illustrating the form of corrugations in the metallic before it is coiled into the spiral form and Figure 4 is an edge view of the crimped bar, with its corrugations illustra-ted by dotted lines, showing the depth thereof.

4The nature of my invention consists in the construction of a volute spring out of a metallic bar having straight edges, but which is otherwise centrally and transversely corrugated, crimped, or uted, or which is simply transversely corrugated. I

In all volute springsfformed ofstraight or grooved bars, as heretofore shaped and constructed,the necessary proximity of the coils in the spring renders it a difficult matter to` obtain an even temper of` the metal, from the fact that when inserted into the tempering hath the oil or liquid cannot freelypass between the coils, and does not reach nor act uniformly upon every portion of the spring. The object of my invention is to obviate this diiiculty, and at the same time produce, with the smallest possible weight of metal, the strongest and most effective spring. Y

To effect this object I pass a suitable Ymetallicbar or strip' between crimping rollers, so formed as to swage the central portion of the bar into transverse corrugations, tapering at either end to a point near to theedgc of the bar, so as to leave the same straight. The corrugations are formed by anindentation of the bar alternately on one side and the other, so that the `depth or height of these corrugations shall not be greater than the original thickness of the bar, nor project beyond its edge, which retains its original thickness. The weakening of the bar, incident to the continuation of the channels or creases to the edge, is thus avoided.

The peculiar form which I impart to the bar bymeans of these transverse corrugations 'will very materially increase the strength of the spring without adding to its weight, whilst the corrugations open channels for .thc free passage of the liquid in the tempering bath between each coil, so that the temper of the entire spring shall be uniform. y l

Although I prefer, for the reasons stated, the form of corrugations which terminate within the edges of the. spring, I contcmpiate crimping the bar transversely from edge to edge, as involving, to a certain extent, the novel and useful features of vmy invention.

The crimped bar may be coiled into the voluto form upon a Gardiner coilingmachine, or be rolled into a spiral coil upon a simple mandrel inn lathe, and subsequently forced into the necessary pyramidal form hyv means of a suitable conical punch and anvil.

Having thus fully described my iinprevement`--in volute springs, I claim as new, and desire to secure byv Letters Patent* A volute or spirallycoiled spring, formed of a metallic bar or strip, transversely crimped :or corrugated, substantially in themanner herein set forth.` v

The foregoing speciiication of my improved flutcd volute spring signed by me this day of June, A. D186?.

" RICHD VOSE.

Witnesses:

ALBERT L. BUTLER, Jns. GILLET. 

